diff --git a/apriltag_imu/sim/README.md b/apriltag_imu/sim/README.md
index fc8cf1a28033abf766c949626736b5ec35e47e09..e34ed10b3d3d12dd04906b717cf1a416b3292ae6 100644
--- a/apriltag_imu/sim/README.md
+++ b/apriltag_imu/sim/README.md
@@ -1,12 +1,14 @@
 # Simulation demos:
 
-- **circle.bag:** Flat circle in Z plane. IMU without noise and not biased.
+- **circle.bag:** Flat circle in Z plane without rotation. IMU without noise and not biased.
 
-- **wave.bag:** Bended circle with sinusoidal translation in Z. IMU without noise and not biased. (old name circleXYZ.bag)
+- **circleRotX.bag:** Flat circle in Z plane with small rotation around X. IMU without noise and not biased.
 
-- **wave_noise_biasY.bag:** Bended circle with sinusoidal translation in Z. IMU with noise and biased only on Y axis (accel. and gyro.). (old name everythingBiasedX.bag)
+- **wave.bag:** Bended circle with sinusoidal translation in Z without rotation. IMU without noise and not biased. (old name circleXYZ.bag)
 
-- **wave_noise_bias.bag:** Bended circle with sinusoidal translation in Z. IMU with noise and biased. (old name everything.bag)
+- **wave_noise_biasY.bag:** Bended circle with sinusoidal translation in Z without rotation. IMU with noise and biased only on Y axis (accel. and gyro.). (old name everythingBiasedX.bag)
+
+- **wave_noise_bias.bag:** Bended circle with sinusoidal translation in Z without rotation. IMU with noise and biased. (old name everything.bag)